'The Princess' episode #125—Ron Penfound as Mr. Smith, one of the men who was looking for the Princess.  He is credited as Ron Penford but is actually Ron Penfound.

 Everyone who grew up in Northeastern Ohio in the late 50's and 60's remembers him as "Captain Penny", a local Cleveland icon. Captain Penny was produced at WEWS-TV in Cleveland, a major ABC affiliate at the time. I am guessing that the ABC connection landed him a part in the show. 
Thanks Scott Benko for this great piece of information!

Marilee Phelps was married to Adam Williams